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Optimize memory use of the low-z tile generation

Volker Krause requested to merge vkrause/marble:reduce-ne-generation-memory-use into master

Memory use is now stable over the entire runtime of about 60-90 minutes, peaking at slightly below 6GB. Previously this was killed for running out of memory about 30% into level 9 generation somewhere beyond 20GB.

Beyond actually making the low-z tile generation work, fixing memory leaks in this code also matters for the on-demand generation process that will run over an extended period of time.

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